Part #: 13778N

WAI 13778N Alternator

⚙️ 17 vehicles fit this part
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Select your vehicle to confirm fitment
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OE Direct Replacement — Bolt-on fit, no modifications needed
🚗Fitment: Nissan, Frontier, Pickup, and Xterra
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Reliable Alternator for Nissan Frontier, Pickup, and Xterra

The WAI 13778N alternator is designed to provide consistent electrical charging and starting performance for select Nissan vehicles. Engineered with an internal fan and regulator, this alternator supports the electrical demands of Nissan Frontier, Pickup, and Xterra models.

Key Features of the WAI 13778N Alternator

  • 12-volt electrical system compatibility
  • Internal fan type for efficient cooling
  • Clockwise (right) rotation direction
  • Includes a single-groove pulley compatible with V-belt drive systems
  • Internal voltage regulator for stable output
  • 70-amp amperage rating suitable for standard electrical loads
  • Part of the Hitachi family of alternators
  • No decoupled or clutch pulley included

Detailed Product Description

The WAI 13778N alternator is built to meet the electrical charging needs of Nissan Frontier, Pickup, and Xterra vehicles. Featuring an internal fan, this alternator maintains optimal operating temperatures by efficiently dissipating heat during operation. The clockwise rotation direction aligns with the original equipment specifications for these Nissan models. Equipped with a single-groove pulley designed for V-belt systems, the alternator ensures proper belt engagement and power transfer. The internal voltage regulator maintains consistent voltage output, protecting your vehicle’s electrical components. With a 70-amp rating, this alternator supports the standard electrical load requirements of the specified Nissan vehicles. As part of the Hitachi family, it adheres to established quality and design standards.

Common Applications and Issues Addressed

  • Replacement for failing or underperforming alternators in Nissan Frontier, Pickup, and Xterra
  • Resolves battery charging problems and electrical system malfunctions
  • Addresses issues with dimming headlights or electrical accessories
  • Eliminates irregular voltage output causing vehicle starting difficulties
  • Prevents overheating through internal fan cooling design

Installation Notes and Tips

Ensure the alternator’s clockwise rotation matches your vehicle’s original equipment specifications. Verify the V-belt pulley groove aligns with your existing belt system. Confirm electrical connections are secure and free of corrosion for optimal performance. It is recommended to test the battery and charging system after installation to confirm proper operation.

Quality Assurance and Warranty

The WAI 13778N alternator is manufactured to meet industry standards for durability and performance. It is part of the Hitachi family, known for reliable electrical components. Please refer to the product documentation or supplier for specific warranty details.

BrandWAI
Part Number13778N
1212
Fan TypeInternal
Rotation DirectionClockwise (right)
Pulley IncludedYes
FamilyHitachi
Pulley Groove Quantity1
Pulley Belt TypeV-belt
Regulator TypeInternal
Decoupled Or Clutch PulleyNo
Amperage Rating70

This part fits 17 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
2008NissanPickupN/AMexico
2007NissanPickupN/AMexico
2005NissanPickupN/AMexico
2004NissanFrontier2.4LL4N/A70 Amp
2004NissanPickupN/AMexico
2004NissanXterra2.4LL4N/A70 Amp
2003NissanFrontier2.4LL4N/A70 Amp
2003NissanXterra2.4LL4N/A70 Amp
2002NissanFrontier2.4LL4N/A70 Amp
2002NissanXterra2.4LL4N/A70 Amp
2001NissanFrontier2.4LL4N/A70 Amp
2001NissanXterra2.4LL4N/A
2000NissanFrontier2.4LL4N/A
2000NissanPickupN/AMexico
2000NissanXterra2.4LL4N/A
1999NissanFrontier2.4LL4N/A
1998NissanFrontierN/A

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

1377823100-3S50023100-3S500R23100-3S50123100-9Z0002310M-3S500RWLR170-757BLR170-757BRLR170-765LR170-766LR170-766B

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.